IAMTuner::SignalPresent
| Microsoft DirectShow 9.0 |
IAMTuner::SignalPresent
The SignalPresent method retrieves the strength of the signal on a given channel.
Syntax
HRESULT SignalPresent( long *plSignalStrength );
Parameters
plSignalStrength
[out] Pointer to a variable that receives a value indicating whether a signal is present on the current channel. Can be one of the following values.
| Value | Description |
| AMTUNER_HASNOSIGNALSTRENGTH | -1 |
| AMTUNER_NOSIGNAL | 0 |
| AMTUNER_SIGNALPRESENT | 1 |
A value of AMTUNER_HASNOSIGNALSTRENGTH means the signal strength cannot be determined at this time.
Return Values
Returns an HRESULT value.
Requirements
Header: Declared in Strmif.h; include Dshow.h.
Library: Use Strmiids.lib.
See Also